/*Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
 *   Copyright (c) <2014-2015>, <Huawei Technologies Co., Ltd>
 *   All rights reserved.
 *
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/
/****************************************************************************
 * Notice of Export Control Law
 * ===============================================
 * Huawei LiteOS may be subject to applicable export control laws and regulations,
 * which might include those applicable to Huawei LiteOS of U.S. and the country in
 * which you are located.
 * Import, export and usage of Huawei LiteOS in any manner by you shall be in
 * compliance with such applicable export control laws and regulations.
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include "vfs_config.h"

#include "sys/mount.h"
#include "errno.h"
#include "fs/fs.h"

#include "inode/inode.h"
#include "stdlib.h"

#include "string.h"
#include "disk.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Variables
 ****************************************************************************/

/****************************************************************************
 * Public Variables
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: getlabel()
 *
 * Description:
 *   getlabel() get the volume label of partition(disk) from FAT filesystem by
 *   the 'target' path
 *
 * Parameters:
 *   target : the path which is the mount point of FAT filesystem device.
 *   label  : the string var pointer, by which passed out label string.
 *
 * Return:
 *   Zero is returned on success; -1 is returned on an error and errno is
 *   set appropriately:
 *
 *   ENOMEM There is no memory for allocated space for var.
 *   EFAULT The pointer 'target' does not pass in corretly.
 *   ENOENT The pointer 'target' pointed to a wrong location.
 *   EPERM The pointer 'target' does not point to a mount inode.
 *   EINVAL The pointer 'label' does not pass in correctly.
 *   EACCES The filesystem which 'target' point to is not supported.
 *
 ****************************************************************************/

int getlabel(const char *target,char* label)
{
  FAR struct inode *mountpt_inode = NULL;
  int errcode = OK;
  int status;
  char *fullpath = (char*)NULL;
  char *relpath = (char*)NULL;
  /* Verify required pointer arguments */

  if (target == NULL || label == NULL)
  {
      errcode = EFAULT;
      goto errout;
  }

  /* Get a absolute path*/
  errcode = vfs_normalize_path((const char *)NULL, target, &fullpath);
  if(errcode < 0)
  {
    errcode = -errcode;
    goto errout;
  }

  /* Find the mountpt */

  mountpt_inode = inode_find(fullpath, (const char **)&relpath);
  /* Verify that the inode is a mountpoint */
  if (!mountpt_inode)
    {
      errcode = ENOENT;
      goto errout_with_fullpath;
    }

  /* Verfy the path is a mountpoint path or file path*/

  if (!INODE_IS_MOUNTPT(mountpt_inode)&&!INODE_IS_BLOCK(mountpt_inode))
    {
      errcode = EPERM;
      goto errout_with_release;
    }

  if(mountpt_inode->u.i_mops && mountpt_inode->u.i_mops->getlabel)
    {
        status = mountpt_inode->u.i_mops->getlabel(mountpt_inode->i_private,label);
          if (status < 0)
            {
              /* The inode is unhappy with the blkdrvr for some reason */
              errcode = -status;
              goto errout_with_release;
            }
          inode_release(mountpt_inode);
          free(fullpath);
          return OK;
    }
  else
    {
        errcode = EACCES;
        goto errout_with_release;
    }

  /* A lot of goto's!  But they make the error handling much simpler */

errout_with_release:
  inode_release(mountpt_inode);
errout_with_fullpath:
  free(fullpath);
errout:
  set_errno(errcode);
  return VFS_ERROR;
}
